Buggy code:
public abstract class MarkupContainer extends Component { private static final Log log = LogFactory . getLog ( MarkupContainer . class ) ; private static final int MINIMAP_MAX_ENTRIES = 6 ; private static final boolean optimizeChildMapsForSpace = false ; private Map childForId = Collections . EMPTY_MAP ; private transient MarkupStream markupStream ; public MarkupContainer ( final String id ) { } public MarkupContainer ( final String id , IModel model ) { } public MarkupContainer add ( final Component child ) { } public final void autoAdd ( final Component component ) { } public final boolean contains ( final Component component , final boolean recurse ) { } public final Component get ( final String path ) { } public String getMarkupType ( ) { } public void internalBeginRequest ( ) { } public void internalEndRequest ( ) { } public final Iterator iterator ( ) { } public void remove ( final String id ) { } public void removeAll ( ) { } public MarkupContainer replace ( final Component child ) { } public final int size ( ) { } public String toString ( ) { } public String toString ( final boolean detailed ) { } public final Object visitChildren ( final Class c , final IVisitor visitor ) { } public final Object visitChildren ( final IVisitor visitor ) { } protected final MarkupStream findMarkupStream ( ) { } protected final MarkupStream getMarkupStream ( ) { } protected void onComponentTagBody ( final MarkupStream markupStream , final ComponentTag openTag ) { } protected void onRender ( ) { } protected final void renderAssociatedMarkup ( final String openTagName , final String exceptionMessage ) { } protected final void renderComponentTagBody ( final MarkupStream markupStream , final ComponentTag openTag ) { } protected final void setMarkupStream ( final MarkupStream markupStream ) { } final MarkupStream getAssociatedMarkupStream ( ) { try { return getApplication ( ) . getMarkupCache ( ) . getMarkupStream ( this , null ) ; } catch ( WicketRuntimeException ex ) { <START_BUG> throw new WicketRuntimeException ( exceptionMessage ( ( ( ( ( ( "Markup<seq2seq4repair_space>of<seq2seq4repair_space>type<seq2seq4repair_space>'" + ( getMarkupType ( ) ) ) + "'<seq2seq4repair_space>for<seq2seq4repair_space>component<seq2seq4repair_space>'" ) + ( getClass ( ) . getName ( ) ) ) + "'<seq2seq4repair_space>not<seq2seq4repair_space>found." ) + "<seq2seq4repair_space>Enable<seq2seq4repair_space>debug<seq2seq4repair_space>messages<seq2seq4repair_space>for<seq2seq4repair_space>wicket.util.resource.Resource<seq2seq4repair_space>to<seq2seq4repair_space>get<seq2seq4repair_space>a<seq2seq4repair_space>list<seq2seq4repair_space>of<seq2seq4repair_space>all<seq2seq4repair_space>filenames<seq2seq4repair_space>tried" ) ) , ex ) ; <END_BUG> } } final boolean hasAssociatedMarkup ( ) { } final void renderAll ( final MarkupStream markupStream ) { } private final void addedComponent ( final Component component ) { } private final Component put ( final Component child ) { } private final void renderNext ( final MarkupStream markupStream ) { } private static final void removedComponent ( final Component component ) { } }

Fix:
throw new WicketRuntimeException ( exceptionMessage ( ( ( ( ( ( "Markup<seq2seq4repair_space>of<seq2seq4repair_space>type<seq2seq4repair_space>'" + ( getMarkupType ( ) ) ) + "'<seq2seq4repair_space>for<seq2seq4repair_space>component<seq2seq4repair_space>'" ) + ( getClass ( ) . getName ( ) ) ) + "'<seq2seq4repair_space>not<seq2seq4repair_space>found<seq2seq4repair_space>or<seq2seq4repair_space>invalid" ) + "<seq2seq4repair_space>Enable<seq2seq4repair_space>debug<seq2seq4repair_space>messages<seq2seq4repair_space>for<seq2seq4repair_space>wicket.util.resource.Resource<seq2seq4repair_space>to<seq2seq4repair_space>get<seq2seq4repair_space>a<seq2seq4repair_space>list<seq2seq4repair_space>of<seq2seq4repair_space>all<seq2seq4repair_space>filenames<seq2seq4repair_space>tried" ) ) , ex ) ;